The only problem with rolling on a server further from your timezone is that it would be harder for you to join a FC that is active. It's easier when you're on a server when everyone is roughly on the same time, but it's dead confusing when you have to use a time zone converter just to find out when the raid is! Also it's impossible to do raiding if you're on a server where they are 16 hours behind you (US) and you're working on the time they schedule the raid .